What iv'e found is when you change the upper arms the whole camber adjustment goes out of place & it seems like more stress is put on the actual aluminum wishbone as opposed to the bush's themselves.
At the factory everything was slotted into place in one assembled piece all built upon the subframe, suspension, engine, ect.
After six months i was getting the same clunk after changing both upper arms on my brera. Powerflex bush's & camber bolts seemed to resolve my issue.
But Jayuk is spot on, his clunk is his pads which my mechanic thought that was the issue with mine. So the sound you have has got to be one of the two suggestions mentioned, but it is hard to pin point where it's coming from. More annoying than anything else with me so i know how you feel about it.
Forgot to mention a give away on mine after both upper arms was change is when you looked under the wheel arch, one wishbone sat slightly lower than the other side. Even though they find thier own postion of rest height when lowered off the jacking points. So it was a dead give away that the camber was out before checking it properly on the 4 wheel alingment machine. But they are none adjustable hence why i opted for a change of upper wishbone bushes.
Last edited by IAMBRERA; 10-10-14 at 13:51.